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<?php |
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/* |
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* This file is part of the Geotools library. |
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* |
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* (c) Antoine Corcy <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\Geotools\Vertex; |
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use League\Geotools\AbstractGeotools; |
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use League\Geotools\Coordinate\Coordinate; |
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use League\Geotools\Coordinate\CoordinateInterface; |
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use League\Geotools\Coordinate\Ellipsoid; |
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/** |
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* Vertex class |
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* |
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* @author Antoine Corcy <[email protected]> |
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*/ |
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class Vertex extends AbstractGeotools implements VertexInterface |
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{ |
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/** |
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* @var integer |
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*/ |
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protected $gradient; |
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/** |
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* @var integer |
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*/ |
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protected $ordinateIntercept; |
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/** |
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* @var integer |
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*/ |
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private $precision = 8; |
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/** |
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* {@inheritDoc} |
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*/ |
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public function setFrom(CoordinateInterface $from) |
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{ |
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$this->from = $from; |
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if (empty($this->to) || ($this->to->getLatitude() - $this->from->getLatitude() === 0)) { |
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return $this; |
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} |
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$this->gradient = ($this->to->getLongitude() - $this->from->getLongitude()) / ($this->to->getLatitude() - $this->from->getLatitude()); |
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$this->ordinateIntercept = $this->from->getLongitude() - $this->from->getLatitude() * $this->gradient; |
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return $this; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getFrom() |
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{ |
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return $this->from; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function setTo(CoordinateInterface $to) |
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{ |
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$this->to = $to; |
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if (empty($this->from) || ($this->to->getLatitude() - $this->from->getLatitude() === 0)) { |
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return $this; |
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} |
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$this->gradient = ($this->to->getLongitude() - $this->from->getLongitude()) / ($this->to->getLatitude() - $this->from->getLatitude()); |
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$this->ordinateIntercept = $this->from->getLongitude() - $this->from->getLatitude() * $this->gradient; |
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return $this; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getTo() |
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{ |
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return $this->to; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getGradient() |
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{ |
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return $this->gradient; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getOrdinateIntercept() |
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{ |
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return $this->ordinateIntercept; |
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} |
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/** |
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* @return integer |
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*/ |
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public function getPrecision() |
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{ |
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return $this->precision; |
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} |
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/** |
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* @param integer $precision |
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* @return $this |
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*/ |
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public function setPrecision($precision) |
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{ |
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$this->precision = $precision; |
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return $this; |
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} |
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/** |
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* Returns the initial bearing from the origin coordinate |
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* to the destination coordinate in degrees. |
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* |
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* @return float The initial bearing in degrees |
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*/ |
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public function initialBearing() |
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{ |
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Ellipsoid::checkCoordinatesEllipsoid($this->from, $this->to); |
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$latA = deg2rad($this->from->getLatitude()); |
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$latB = deg2rad($this->to->getLatitude()); |
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$dLng = deg2rad($this->to->getLongitude() - $this->from->getLongitude()); |
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$y = sin($dLng) * cos($latB); |
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$x = cos($latA) * sin($latB) - sin($latA) * cos($latB) * cos($dLng); |
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return (float) (rad2deg(atan2($y, $x)) + 360) % 360; |
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} |
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/** |
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* Returns the final bearing from the origin coordinate |
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* to the destination coordinate in degrees. |
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* |
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* @return float The final bearing in degrees |
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*/ |
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public function finalBearing() |
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{ |
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Ellipsoid::checkCoordinatesEllipsoid($this->from, $this->to); |
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$latA = deg2rad($this->to->getLatitude()); |
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$latB = deg2rad($this->from->getLatitude()); |
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$dLng = deg2rad($this->from->getLongitude() - $this->to->getLongitude()); |
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$y = sin($dLng) * cos($latB); |
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$x = cos($latA) * sin($latB) - sin($latA) * cos($latB) * cos($dLng); |
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return (float) ((rad2deg(atan2($y, $x)) + 360) % 360 + 180 ) % 360; |
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} |
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/** |
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* Returns the initial cardinal point / direction from the origin coordinate to |
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* the destination coordinate. |
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* @see http://en.wikipedia.org/wiki/Cardinal_direction |
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* |
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* @return string The initial cardinal point / direction |
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*/ |
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public function initialCardinal() |
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{ |
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Ellipsoid::checkCoordinatesEllipsoid($this->from, $this->to); |
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return $this->cardinalPoints[(integer) round($this->initialBearing() / 22.5)]; |
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} |
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/** |
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* Returns the final cardinal point / direction from the origin coordinate to |
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* the destination coordinate. |
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* @see http://en.wikipedia.org/wiki/Cardinal_direction |
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* |
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* @return string The final cardinal point / direction |
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*/ |
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public function finalCardinal() |
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{ |
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Ellipsoid::checkCoordinatesEllipsoid($this->from, $this->to); |
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return $this->cardinalPoints[(integer) round($this->finalBearing() / 22.5)]; |
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} |
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/** |
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* Returns the half-way point / coordinate along a great circle |
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* path between the origin and the destination coordinates. |
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* |
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* @return CoordinateInterface |
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*/ |
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public function middle() |
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{ |
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Ellipsoid::checkCoordinatesEllipsoid($this->from, $this->to); |
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$latA = deg2rad($this->from->getLatitude()); |
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$lngA = deg2rad($this->from->getLongitude()); |
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$latB = deg2rad($this->to->getLatitude()); |
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$lngB = deg2rad($this->to->getLongitude()); |
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$bx = cos($latB) * cos($lngB - $lngA); |
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$by = cos($latB) * sin($lngB - $lngA); |
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$lat3 = rad2deg(atan2(sin($latA) + sin($latB), sqrt((cos($latA) + $bx) * (cos($latA) + $bx) + $by * $by))); |
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$lng3 = rad2deg($lngA + atan2($by, cos($latA) + $bx)); |
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return new Coordinate(array($lat3, $lng3), $this->from->getEllipsoid()); |
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} |
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/** |
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* Returns the destination point with a given bearing in degrees travelling along a |
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* (shortest distance) great circle arc and a distance in meters. |
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* |
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* @param integer $bearing The bearing of the origin in degrees. |
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* @param integer $distance The distance from the origin in meters. |
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* |
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* @return CoordinateInterface |
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*/ |
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public function destination($bearing, $distance) |
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{ |
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$lat = deg2rad($this->from->getLatitude()); |
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$lng = deg2rad($this->from->getLongitude()); |
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$bearing = deg2rad($bearing); |
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$endLat = asin(sin($lat) * cos($distance / $this->from->getEllipsoid()->getA()) + cos($lat) * |
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sin($distance / $this->from->getEllipsoid()->getA()) * cos($bearing)); |
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$endLon = $lng + atan2(sin($bearing) * sin($distance / $this->from->getEllipsoid()->getA()) * cos($lat), |
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cos($distance / $this->from->getEllipsoid()->getA()) - sin($lat) * sin($endLat)); |
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return new Coordinate(array(rad2deg($endLat), rad2deg($endLon)), $this->from->getEllipsoid()); |
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} |
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/** |
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* Returns true if the vertex passed on argument is on the same line as this object |
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* |
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* @param Vertex $vertex The vertex to compare |
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* @return boolean |
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*/ |
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public function isOnSameLine(Vertex $vertex) { |
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if (is_null($this->getGradient()) && is_null($vertex->getGradient()) && $this->from->getLongitude() == $vertex->getFrom()->getLongitude()) { |
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return true; |
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} elseif (!is_null($this->getGradient()) && !is_null($vertex->getGradient())) { |
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return ( |
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bccomp($this->getGradient(), $vertex->getGradient(), $this->getPrecision()) === 0 |
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&& |
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bccomp($this->getOrdinateIntercept(), $vertex->getOrdinateIntercept(), $this->getPrecision()) ===0 |
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); |
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} else { |
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return false; |
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} |
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} |
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/** |
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* Returns the other coordinate who is not the coordinate passed on argument |
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* @param Coordinate $point |
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* @return null|Coordinate |
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*/ |
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public function getOtherCoordinate(CoordinateInterface $coordinate) { |
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if ($coordinate->isEqual($this->from)) { |
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return $this->to; |
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} else if ($coordinate->isEqual($this->to)) { |
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return $this->from; |
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} |
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return null; |
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} |
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} |
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This check looks for assignments to scalar types that may be of the wrong type.
To ensure the code behaves as expected, it may be a good idea to add an explicit type cast.